<template>
  <div>
    <!--面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图区-->
    <el-card>
      <!--警告区域-->
      <el-alert
          title="注意：只允许为第三级分类设置相关参数！"
          type="warning"
          :closable="false"
          show-icon>
      </el-alert>
      <!--选择商品分类参数区域-->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!--选择商品分类的级联选择框-->
          <el-cascader
              v-model="selectedKeys"
              :options="cateList"
              :props="cateProps"
              @change="handleChange"></el-cascader>
        </el-col>
      </el-row>
      <!--tab页签区-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!--添加动态参数的面板-->
        <el-tab-pane label="动态参数" name="many">
          <!--添加参数的按钮-->
          <el-button type="primary" size="primary"
                     :disabled="isBtnDisabled"
                     @click="adddialogVisible = true"
                     class="addAttrBtn">添加参数</el-button>
          <!--动态参数表格-->
          <el-table :data="manyTableData" border stripe>
            <!--展开行-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!--循环渲染tag标签-->
                <el-tag
                    v-for="(item,index) in scope.row.attr_vals"
                    :key="index"
                    closable
                    @close="handleClose(index,scope.row)">
                  {{item}}
                </el-tag>
                <!--输入的文本框 -->
                <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!--添加按钮-->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!--索引-->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!--添加静态属性的面板-->
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="primary" :disabled="isBtnDisabled"
                     @click="adddialogVisible = true"
                     class="addAttrBtn">添加属性</el-button>
          <!--静态属性表格-->
          <el-table :data="onlyTableData" border stripe>
            <!--展开行-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!--循环渲染tag标签-->
                <el-tag
                    v-for="(item,index) in scope.row.attr_vals"
                    :key="index"
                    closable
                    @close="handleClose(index,scope.row)">
                  {{item}}
                </el-tag>
                <!--输入的文本框 -->
                <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!--添加按钮-->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!--索引-->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!--添加参数的对话框-->
    <el-dialog
        :title="'添加'+titleText"
        :visible.sync="adddialogVisible"
        width="50%"
        @close="addDialogClosed">
      <el-form :model="addAttrForm" :rules="addAttrFormRules" ref="addAttrFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addAttrForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="adddialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
    </el-dialog>
    <!--修改参数的对话框-->
    <el-dialog
        :title="'修改'+titleText"
        :visible.sync="editdialogVisible"
        width="50%"
        @close="editDialogClosed">
      <el-form :model="editAttrForm" :rules="editAttrFormRules" ref="editAttrFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editAttrForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="editdialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Params",
  data() {
    return {
      //商品分类列表
      cateList: [],
      //配置级联选择框
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children' //指定父子节点的嵌套属性
      },
      //级联选择框双向绑定选中的id值
      selectedKeys: [],
      //被激活/被选中的页签的name
      activeName: 'many',
      //动态参数列表
      manyTableData: [],
      //静态属性列表
      onlyTableData: [],
      //控制添加对话框的显示/隐藏
      adddialogVisible: false,
      //添加参数的表单数据对象
      addAttrForm: {},
      //添加参数的验证规则对象
      addAttrFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      //控制修改对话框的显示/隐藏
      editdialogVisible: false,
      //修改参数的表单数据对象
      editAttrForm: {},
      //修改表单数据的验证规则对象
      editAttrFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      //控制按钮和文本框的切换显示
      inputVisible: false,
      //文本框中输入的内容
      inputValue: [],

    }
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const { data :res }= await this.$http.get('categories');
      if(res.meta.status !== 200) return this.$message.error('获取商品分类数据失败');
      this.cateList = res.data;
    },
    //级联选择框选中项发生变化会触发这个函数
    handleChange() {
      if(this.selectedKeys.length !== 3) {
        this.selectedKeys = [];
        return;
      }
      //证明选中的是三级分类
      this.getParamsList();
      // console.log(this.selectedKeys);
    },
    //tab页签点击事件的处理函数
    handleTabClick() {
      this.getParamsList();
    },
    async getParamsList() {
      //根据所选分类的id和当前所处的面板，获取对应的参数，请求参数列表
      const { data: res }= await this.$http.get(`categories/${this.cateId}/attributes`,{params: {sel : this.activeName}});
      if(res.meta.status !== 200) return this.$message.error('获取参数列表失败');
      //因为动态参数和静态属性的数据都保存在res.data上，为之后渲染数据方便，应该先做判断

      //获得每行的数据，将其attr_vals分割成数组
      //给每一行数据都创建自己的inputVisible(控制文本输入框的显示与隐藏)以及inputValue(文本框输入的值)
      res.data.forEach(item => {
          item.attr_vals = (item.attr_vals ? item.attr_vals.split(' ') : []); //数组
          //控制文本框的显示与隐藏
          item.inputVisible = false;
          item.inputValue = '';
      })
      console.log(res.data);
      if(this.activeName === 'many') { //动态参数
        this.manyTableData = res.data;
      }else { //静态属性
        this.onlyTableData = res.data;
      }
    },
    //添加参数对话框关闭，清空表单
    addDialogClosed() {
      this.$refs.addAttrFormRef.resetFields();
    },
    //点击'确定'按钮，添加参数
    addParams() {
      //在添加之前，进行表单的预验证
      this.$refs.addAttrFormRef.validate(async valid => {
        //没有通过校验
        if(!valid) return;
        //可以通过请求添加参数
        const { data : res } = await this.$http.post(`categories/${this.cateId}/attributes`,{
          attr_name: this.addAttrForm.attr_name,
          attr_sel: this.activeName
        });
        if(res.meta.status !== 201) return this.$message.error('添加参数失败');
        this.$message.success('添加参数成功');
        //更新参数列表
        this.getParamsList();
        //关闭添加参数对话框
        this.adddialogVisible = false;
      })
    },
    //点击'修改'按钮，弹出修改参数对话框
    async showEditDialog(attr_id) {
      this.editdialogVisible = true;
      //查询当前参数的信息
      const { data : res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
          {params: {attr_sel: this.activeName}});
      if(res.meta.status !== 200) return this.$message.error('查询当前参数的信息失败')
      this.editAttrForm = res.data;

    },
    //修改参数对话框关闭，清空表单
    editDialogClosed() {
      this.$refs.editAttrFormRef.resetFields();
    },
    //点击'确定'按钮，修改参数
    editParams() {
      //首先预校验
      this.$refs.editAttrFormRef.validate(async valid => {
        if(!valid) return; //校验失败
        //可以发起网络请求修改参数
        const { data : res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editAttrForm.attr_id}`,
            {attr_name: this.editAttrForm.attr_name,
                   attr_sel: this.activeName});
        if(res.meta.status !== 200) return this.$message.error('修改参数失败');
        this.$message.success('修改参数成功');
        //更新参数列表
        this.getParamsList();
        this.editdialogVisible = false;

      })

    },
    //点击'删除'按钮，删除参数
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if(confirmResult === 'cancel') return this.$message.info('已取消删除');
      //发起删除的网络请求
      const { data : res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`);
      if(res.meta.status !== 200) return this.$message.error('删除参数失败');
      this.getParamsList();
      this.$message.success("删除参数成功");
    },
    //文本框失去焦点或按下了enter键 都会触发
    async handleInputConfirm(attr) {
      if(attr.inputValue.trim().length === 0){
        attr.inputValue = '';
        attr.inputVisible = false;
        return;
      }
      //如果没有return，说明输入了有效内容，需要做后续处理
      attr.attr_vals.push(attr.inputValue.trim());
      //发起网络请求，将这一次的操作保存到数据库
      this.saveAttrVals(attr);
      attr.inputValue = '';
      attr.inputVisible = false;
    },
    //将对attr_vals的操作保存到数据库
    async saveAttrVals(attr) {
      const { data : res } = await this.$http.put(`categories/${this.cateId}/attributes/${attr.attr_id}`,{
        attr_name: attr.attr_name,
        attr_sel: attr.attr_sel,
        attr_vals: attr.attr_vals.join(' ')
      });
      if(res.meta.status !== 200) return this.$message.error('修改参数项失败');
      this.$message.success('修改参数项成功');
    },
    //点击按钮，展示文本输入框
    showInput(attr) {
      attr.inputVisible = true;
      //让文本框自动获得焦点
      this.$nextTick(() => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    //删除对应的参数可选项
    handleClose(index,attr) {
      attr.attr_vals.splice(index,1);
      this.saveAttrVals(attr);
    }

  },
  computed: {
    //Boolean值
    //如果按钮需要被禁用，则返回true；否则返回false
    isBtnDisabled() {
      if(this.selectedKeys.length === 0){
        return true;
      }else{
        return false;
      }
    },
    //当前选中的三级分类的Id
    cateId() {
      return this.selectedKeys.slice(-1);
    },
    //动态计算标题的文本
    titleText() {
      if(this.activeName === 'many'){
        return '动态参数';
      }else{
        return '静态属性';
      }
    },

  }
}
</script>

<style lang="less" scoped>
  .cat_opt {
    margin: 15px 0;
  }
  .addAttrBtn {
    margin-bottom: 15px;
  }
  .el-tag {
    margin: 10px;
  }
  .input-new-tag {
    width: 120px;
  }
</style>
